[jira] [Created] (MAPREDUCE-5981) Log levels of certain MR logs can be changed to DEBUG

["Varun Saxena (JIRA)" <ji...@apache.org>]

Varun Saxena created MAPREDUCE-5981:
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             Summary: Log levels of certain MR logs can be changed to DEBUG
                 Key: MAPREDUCE-5981
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5981
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
            Reporter: Varun Saxena
            Assignee: Varun Saxena


Following map reduce logs can be changed to DEBUG log level.

1. In org.apache.hadoop.mapreduce.task.reduce.Fetcher#copyFromHost(Fetcher.java : 313), the second log is not required to be at info level. This can be moved to debug as a warn log is anyways printed if verifyReply fails.

      SecureShuffleUtils.verifyReply(replyHash, encHash, shuffleSecretKey);
      LOG.info("for url="+msgToEncode+" sent hash and received reply");

2. Thread related info need not be printed in logs at INFO level. Below 2 logs can be moved to DEBUG
    a) In org.apache.hadoop.mapreduce.task.reduce.ShuffleSchedulerImpl#getHost(ShuffleSchedulerImpl.java : 381), below log can be changed to DEBUG

   LOG.info("Assigning " + host + " with " + host.getNumKnownMapOutputs() +
               " to " + Thread.currentThread().getName());

    b) In org.apache.hadoop.mapreduce.task.reduce.ShuffleScheduler.getMapsForHost(ShuffleSchedulerImpl.java : 411), below log can be changed to DEBUG
 LOG.info("assigned " + includedMaps + " of " + totalSize + " to " +
             host + " to " + Thread.currentThread().getName());
 



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